424 Annals of the Carnegie Museum. 



The insects, which are referred to the present genus, are distributed 

 over the tropical portions of America, Africa, and the Oriental Region. 

 The various species have a general resemblance one to another, but 

 may be separated by such characters as size, color, and the form of the 

 last ventral segment of the male abdomen, which latter is greatly 

 developed into a scoop-like or spade-like prolongation. Upward of a 

 dozen species have already been recognized in Central and South 

 American countries, and now three others are added. The following 

 table will aid in separating the American forms. 



Synopsis of Tropical American Species of Aphonomorphus. 



A. Auditory opening of the anterior tibiae, oblong or elliptical. 



b. Last joint of the maxillary palpi hatchet-shaped, usually with one side more 

 expanded than the other, the apex often obliquely truncated. Eyes 

 very prominent. 

 c. Ocelli of moderate size. Apex of the vertex concolorous (17 to 23 mm. in 

 length). 

 d. Smaller (17 mm. in length), body not depressed. Posterior meta- 

 tarsus armed with normal teeth or spines [Guiana and Brazil]. 



tnutus Saussure. 

 dd. Larger (22-23 mm.); the posterior metatarsus armed with large 

 spines or teeth. 

 e. Posterior margin of the pronotum decidedly angulate at its 



middle. [French Guiana] variegaliis Chopard. 



ee. Posterior margin of the pronotum broadly rounded at its middle. 

 /. Cinereous punctulate with fuscous. Median vein five-branched 



[Bolivia] silens Saussure. 



ff. General color rufo-testaceous. Median vein of the tegmina 



seven-branched. [French Guiana] wo/or Chopard. 



cc. Ocelli very large, the middle one transverse. Apex of the vertex and of 



the front above yellow [Mexico] flavifrons Saussure. 



hb. Last joint of the maxillary palpi funnel-shaped, equally expanded on both 

 sides of the middle, the apex not decidedly obliquely truncated. Eyes 

 variable. 

 c. Tegmina, body, and legs varied with fuscous spots, patches, and lines. 

 d. Body moderately graceful, subcylindrical, not depressed. Head 

 above and the pronotum marked with castaneous. 

 e. Him! tibiae rather sparsely spined externally, internally five-spined 



[Colombia] timidus Saussure. 



ee. Hind tibia; more numerously spined, externally seven-, internally 



nine-spined. [Bolivia] conspersus sp. nov. 



dd. Body not especially slender, somewhat depressed. Head above and 

 the pronotum not prominently marked with castaneous or 

 brown. 



